Sliding Sleeve In Oil & Gas Completion
Sliding sleeves – sometimes called sliding side doors (SSDs) – are manipulated by wireline locks and use nipple profiles. The figure below shows a typical siding sleeve. This sleeve uses a collet to ‘hold’ the sleeve in one of three positions (open, equalizing, and closed). Sliding sleeves have earned a poor reputation – they either fail to open or close. Scale, asphaltene, solid debris, or erosion are the leading causes of these problems.
https://www.drillingmanual.com/sliding-sleeve-in-oil-gas-completion/